An Angle Of Arrival Location Estimation Technique for Existing GSM Networks

In this paper, the information contained by the measurement report of a GSM, being the received signal strengths of up to seven base station antennas, is used to locate a mobile. First the restrictions of using a real network situation are derived, after which a method to take into account the antenna patterns is proposed, for which we formulate an extended path loss model. This is subsequently used to determine the angle of arrival of a terminal, by using the differences of the measured signal strengths. Simulations provide information on the achievable accuracy; a field test confirms the applicability. The proposed algorithm can be implemented as network or terminal-based method and it outperforms the accuracy of Enhanced Cell-ID.